import Vue from 'vue'

// v-dialogDrag: 弹窗拖拽
Vue.directive('dialogDrag', {
  bind(el, binding, vnode, oldVnode) {
    const dialogHeaderEl = el.querySelector('.el-dialog__header')
    const dragDom = el.querySelector('.el-dialog')
    dialogHeaderEl.style.cursor = 'move'

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null)

    dialogHeaderEl.onmousedown = (e) => {
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - dialogHeaderEl.offsetLeft
      const disY = e.clientY - dialogHeaderEl.offsetTop

      // 获取到的值带px 正则匹配替换
      let styL, styT

      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
      if (sty.left.includes('%')) {
        styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100)
        styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100)
      } else {
        styL = +sty.left.replace(/\px/g, '')
        styT = +sty.top.replace(/\px/g, '')
      }

      document.onmousemove = function(e) {
      // 通过事件委托，计算移动的距离
        const l = e.clientX - disX
        const t = e.clientY - disY
        // 移动当前元素
        dragDom.style.left = `${l + styL}px`
        dragDom.style.top = `${t + styT}px`
        // 将此时的位置传出去
        // binding.value({x:e.pageX,y:e.pageY})
      }
      document.onmouseup = function(e) {
        document.onmousemove = null
        document.onmouseup = null
      }
    }
  }
})

// v-enterNumber: 限制输入框只能输入整数
Vue.directive('enterNumber', {
  inserted: function(el) {
    el.addEventListener('keypress', function(e) {
      e = e || window.event
      const charcode = typeof e.charCode === 'number' ? e.charCode : e.keyCode
      const re = /\d/
      if (!re.test(String.fromCharCode(charcode)) && charcode > 9 && !e.ctrlKey) {
        if (e.preventDefault) {
          e.preventDefault()
        } else {
          e.returnValue = false
        }
      }
    })
  }
})
// v-toFixed: 实现只能输入数字，或输入2位或4位小数（通过传参控制）
Vue.directive('toFixed', {
  componentUpdated(el, binding) {
    const toFixedLength = binding.value
    if (!toFixedLength) {
      return false
    }
    const ele = el.tagName === 'INPUT' ? el : el.querySelector('input')
    ele.addEventListener('input', () => {
      let val = ele.value
      if (isNaN(val)) {
        ele.value = ''
        return false
      }
      if (typeof val === 'number') {
        val = val.toString()
      }
      if (typeof val === 'string') {
        switch (toFixedLength) {
          case 2:
            val = val.replace(/^(-)*(\d+)\.(\d\d).*$/, '$1$2.$3')
            break
          case 3:
            val = val.replace(/^(-)*(\d+)\.(\d\d\d).*$/, '$1$2.$3')
            break
          case 4:
            val = val.replace(/^(-)*(\d+)\.(\d\d\d\d).*$/, '$1$2.$3')
            break
          case 6:
            val = val.replace(/^(-)*(\d+)\.(\d\d\d\d\d\d).*$/, '$1$2.$3')
            break
        }
        ele.value = val
      }
    })
  }
})
